I just got new BFG’s All terrain T/A KO that you mention it the OP. I went with a 1” taller tire. I loved the tires until it was time to pull over the mountain. My truck is very similar to yours but a 08 2500 and this last year I was not able to pull over Mt. Hood at speed. I kept running the what had changed scenarios through my head and the only thing I could think of is that I got the extra inch to fill out the wheel well decent.
Maybe I should start a new thread on if tire height could have hurt me so badly as to cost me from 55 MPH to 40 MPH over the hill?